package com.atguigu.eduservice.service.impl;

import com.alibaba.excel.EasyExcel;
import com.atguigu.eduservice.entity.EduSubject;
import com.atguigu.eduservice.entity.excel.SubjectData;
import com.atguigu.eduservice.entity.subject.OneSubject;
import com.atguigu.eduservice.entity.subject.TwoSubject;
import com.atguigu.eduservice.listener.SubjectExcelListener;
import com.atguigu.eduservice.mapper.EduSubjectMapper;
import com.atguigu.eduservice.service.EduSubjectService;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.apache.ibatis.annotations.One;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

/**
 * <p>
 * 课程科目 服务实现类
 * </p>
 *
 * @author testjava
 * @since 2022-02-16
 */
@Service
public class EduSubjectServiceImpl extends ServiceImpl<EduSubjectMapper, EduSubject> implements EduSubjectService {


    //添加课程分类
    @Override
    public void saveSubject(MultipartFile file,EduSubjectService subjectService) {
        try {
            //文件输入流
            InputStream in = file.getInputStream();
            EasyExcel.read(in, SubjectData.class,new SubjectExcelListener(subjectService)).sheet().doRead();

        }catch (Exception e){

        }
    }



    //课程分类列表（树形）
    @Override
    public List<OneSubject> getAllOneTwoSubject() {

        //1查询所有一级分类  parentid = 0
        QueryWrapper<EduSubject> wrapperOne=new QueryWrapper<>();
        wrapperOne.eq("parent_id","0");
        List<EduSubject> OneSubjectList = baseMapper.selectList(wrapperOne);

        //2查询所有二级分类  parentid != 0
        QueryWrapper<EduSubject> wrapperTwo=new QueryWrapper<>();
        wrapperTwo.ne("parent_id","0");
        List<EduSubject> TwoSubjectList = baseMapper.selectList(wrapperTwo);

        
        //创建list集合，用于储存最终封装数据
        List<OneSubject> finalSubjectList =new ArrayList<>();
        
        
        //3封装一级分类
        //查询出来所有的一级分类list案合遍历，得到每个一级分类对象，获取每个一级分类对象值
        //封装到要求的1ist集合里面 List（OneSubject）finalSubjectList
        for (int i = 0; i < OneSubjectList.size(); i++) {
            //把eduSubject里面值获取出来，放到OneSubject对象望面
            EduSubject eduSubject = OneSubjectList.get(i);
            OneSubject oneSubject=new OneSubject();
//            oneSubject.setId(eduSubject.getId());
//            oneSubject.setTitle(eduSubject.getTitle());

            //比上面更加简便的方法
            BeanUtils.copyProperties(eduSubject,oneSubject);
            //多个OneSubject放 到finalSubjectList里面
            finalSubjectList.add(oneSubject);

            //在一级分类循环遍历查询所有的二级分类
            //创建list集合封装每个一级分类的二级分类
            List<TwoSubject> TwoFinalSubjectList=new ArrayList<>();
            //遍历二级分类list集合
            for (int m = 0; m < TwoSubjectList.size(); m++) {
                EduSubject tSubject = TwoSubjectList.get(m);
                if(tSubject.getParentId().equals(eduSubject.getId()))
                {
                    TwoSubject twoSubject=new TwoSubject();
                    //把tSubject值复制到TwoSubject里面，放到TwoFinalSubjectList里面
                    BeanUtils.copyProperties(tSubject,twoSubject);
                    TwoFinalSubjectList.add(twoSubject);
                }


            }
            //把一级下面所有二级分类放到一级分类里面
            oneSubject.setChildren(TwoFinalSubjectList);

        }

        return finalSubjectList;
    }
}
